Alright Gang here is my tutorial. I’ve typed up materials and links but for the most part, its just the 25 minute video. Hope you dont mind that. I’ve added some time stamps so you cab Skip around later.
Let me know how this is. I can also do a write up I suppose but this was more fun
1:00 Converters and general tidbits
5:15 How to Turn on Supplies
9:10 How to DC isolate
converter yes. Get the same one. Just pick if youd rather charge at 50A up to 14s or at 20a up to 22s.
Keep in mind you can also hook up as many of these converters side by side as you want. the DC supplies are theoretically capable of doing 60a so anything below that is fine at one time. so you can get two converters, one for 50a and one for 22s.
If i had $ then I would use different supplies. Those dell N70P are nice because they are easily turned on and dirt cheap. like if you buy 8 at once they come out to less than $10each. But they are huge and run hot
Any DC supply thats server grade and works fine as they are all 12v. Important is to know how to turn it on (solder pins together)
Lets start by figuring out if you want 20a at 22s or 50a at 14s , or options for both? from that we will find you some supplies. Then based on how many s you want to start with we know how many supplies youll need
That definitely helps. 750w supplies are cheap and will allow you to max out the 50a converter easily, as these supplies provide ~63amps)
So if you want the smaller form factor and higher efficiency supply I would recommend the
Hp Dps-750rb supplies. Easy to rig up and smaller form factor.
Otherwise the Dell n750p will do for a larger cheaper setup.
5 of these will get you to 60v.
You can start with that and add on supplies at any point really easily. So start with 5 and then add as You go along. The converter will need 9 supplies in order to max out at out at 96v output (108v) input. You can even mix and match supplies as long as you consider that the smallest wattage will bottleneck.
If by *mount" you mean stacked in top of each other ? I just stack them and that’s it. I don’t ever move it so there’s no need to mount anything
I’m gonna be honest and say that I am a
function >> form
guy. If You want it to look good then I’m not gonna be a lot of help
What I can say is that the way we are doing it. There are very few (moment can think of atm) special considerations you’ll need to take , Since the cases are all still tied to earth.
Also don’t forget you’ll need a good amount of 10awg or equivalent for the DC side and a bunch (1 per supply) of those power connectors and splice them in parallel or get a multiplug.
it’s got enough 20x20 rails and hardware to configure almost any configuration.
I’ll see what the Dell PSUs look like when they get here and make a frame and handle to hold them all in as compact and form fitting as I can, and then worry about enclosing the case later if I sense the need…
yeah wiring wondering if an 8 plug power strip connected to a 20amp house circuit will work. Or just DIY a parallel wall plug solution.
the DC side seems easy peasy crimping on 10awg wire connectors, I may investigate a bolt thru mechanical connection.
I’m off to watch your vid again for like the 5th time…
so those supplies you have are Gold type so thats 92% efficiency.
so lets say you want to charge 50.4V at 20A then the power drawn from the house plug will be
(50.4v20a)/(0.92110v) is 9.9a from the wall. So linearly you can safely charge at 20s and 20a no before you hit real problems on the socket side
Now that you mention it i did some maths
Probably by design. the converters are actually rated at just under what a 110v/20a home plug will do. 96v*20a = 1920W at 92% efficiency thats 2087W so thats actually super close to the 2200W a plug will provide.